What it is
A simple humectant that draws water into the outer layer of skin. It is in almost every Korean moisturiser, toner and essence.
On a Korean label
Written 글리세린. Ingredients are listed from most to least, so glycerin often sits right after water (정제수).
Korean rules
The Korean ingredient dictionary lists no limit, label caution or functional-ingredient status for it.
Questions
What is 글리세린?
Glycerin, a humectant.
What is 정제수?
Purified water — usually the first ingredient.
Sources
Checked 26 October 2026. Rules change — the official texts above are the final word.